package com.ouran.common;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import com.ouran.controller.user.UserController;
import com.ouran.model.user.User;
 
 
/**
 * 用户登陆权限拦截
 * @author lijiajun
 * 2018/08/03
 */
public class CommonInterceptor extends HandlerInterceptorAdapter{
	public Logger logger = Logger.getLogger(UserController.class);

    /** 
     * 在业务处理器处理请求之前被调用 
     * 如果返回false 
     *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
     * 如果返回true 
     *    执行下一个拦截器,直到所有的拦截器都执行完毕 
     *    再执行被拦截的Controller 
     *    然后进入拦截器链, 
     *    从最后一个拦截器往回执行所有的postHandle() 
     *    接着再从最后一个拦截器往回执行所有的afterCompletion() 
     */  
    @Override  
    public boolean preHandle(HttpServletRequest request,  
            HttpServletResponse response, Object handler) throws Exception {  
        logger.info("==============执行顺序: 1、preHandle================");  
		String requestUri = request.getRequestURI();
		String contextPath = request.getContextPath();
		String url = requestUri.substring(contextPath.length());
      
		logger.info("requestUri:"+requestUri);  
		logger.info("contextPath:"+contextPath);  
        logger.info("url:"+url);  
        
        User user =  (User)request.getSession().getAttribute("user"); 
        if(user == null){
        	logger.info("Interceptor：跳转到login页面！");
        	request.getRequestDispatcher("/user/login.jsp").forward(request, response);
        	return false;
        }else
            return true;   
    }  
  
    /**
     * 在业务处理器处理请求执行完成后,生成视图之前执行的动作   
     * 可在modelAndView中加入数据，比如当前时间
     */
    @Override  
    public void postHandle(HttpServletRequest request,  
            HttpServletResponse response, Object handler,  
            ModelAndView modelAndView) throws Exception {   
    	logger.info("==============执行顺序: 2、postHandle================");  
    }  
  
    /** 
     * 在DispatcherServlet完全处理完请求后被调用,可用于清理资源等  
     *  
     * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion() 
     */  
    @Override  
    public void afterCompletion(HttpServletRequest request,  
            HttpServletResponse response, Object handler, Exception ex)  
            throws Exception {  
    	logger.info("==============执行顺序: 3、afterCompletion================");  
    }  
 
}  
